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  • 1
    Electronic Resource
    Electronic Resource
    Changes in mean trabecular orientation in the medial condyle of the proximal tibia in osteoarthritis (1995)
    Springer
    Calcified tissue international 57 (1995), S. 69-73 
    Details
    ISSN: 1432-0827
    Keywords: Trabecular orientation ; Osteoarthritis ; Medial tibial condyle ; Subchondral sclerosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract In osteoarthritis of the knee, degenerative changes occur in the articular cartilage and underlying subchondral bone, particularly of the medial tibial condyle. Cancellous bone sclerosis that accompanies osteoarthritis is not only the result of an increase in bone volume fraction but also a change in trabecular structure. In a comparison with agematched controls (n=4), osteoarthritis (n=11) demonstrated a significant (P≤0.05) increase in bone volume fraction and trabecular thickness. Overal trabecular orientation in the osteoarthritic group was more vertical or perpendicular to the articular surface than the control group (P≤0.05) especially in the trabeculae of the cancellous bone layer closest to the articular surface. These alterations in trabecular bone structure could have significant consequences for the mechanical properties of osteoarthritic bone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299000
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Kinematic data acquisition system for two- or three-dimensional motion analysis (1981)
    Springer
    Medical & biological engineering & computing 19 (1981), S. 287-290 
    Details
    ISSN: 1741-0444
    Keywords: 3-D motion analysis ; Film drive unit ; L.E.D. markers ; Still camera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract This paper presents a novel data acquisition svstem for motion analysis in two or three dimensions. Emphasis is placed on a relatively simple method of data collecting requiring minimal equipment. The system consists of an ordinary 35 mm camera (one camera for two dimensions or two cameras for analysis in three dimensions), infrared light emitting diodes (l.e.d) used as markers, and an electronic control circuit. The camera records successive positions of pulsed infrared l.e.d.s. which are attached over anatomical landmarks, to produce sequences of dots on the film. The resulting trajectories of the flashing diodes are digitised to generate numerical values which serve as input data to the computer carrying out the actual motion analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442546
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Semiautomatic three-dimensional knee motion assessment system (1992)
    Springer
    Medical & biological engineering & computing 30 (1992), S. 343-350 
    Details
    ISSN: 1741-0444
    Keywords: Gait ; Knee joint ; Optoelectric ; Stair-climbing ; Three-dimensional
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A semiautomatic three-dimensional knee motion assessment system has been developed based on an optoelectric motion tracking system connected to an IBM-compatible computer. Critical decisions made in implementing the software component of the system include the modelling of the thigh and lower leg segments, calculating the knee angles, reaction forces, and moments; the file structure used and the format of the programs used to process the data are outlined. Once the subject-specific data have been collected, the system of programs requires no other user-intervention during processing. Also, selected curve parameters are automatically extracted from the output and combined with the subject-specific data that include precision X-ray and anthropometric data, which are all added to a knee motion assessment database. The automated portion of the system frees the experimenter from data processing and allows concentration on data analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02446973
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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